We use a paraxial approximating solution to calculate the point spread function of the collinear holographic storage system and show that the point spread function can be dramatically enhanced by the reference pattern with random binary phase modulation or random phase modulation.
We propose a paraxial solution for pixel shift selectivity, which can simulate the pixel shift selectivity in two
dimensions and in wide range easily. Thus, the effect of different reference patterns can be calculated in detail. From the
simulation result, we conclude that the pixel shift selectivity get worse for amplitude modulation reference patterns.
Making no modulation is the best reference pattern for pixel shift selectivity, however the point spread function will be
worst in this case. To get an optimum system in both pixel shift selectivity and point spread function, the reference
pattern with phase modulation will be the best choice.
In the paper, we design a sub-wavelength level polarizer to replace the traditional polarizer in
various optical applications. The structure of the polarizer is a one-dimension periodic grating. It has
three layers with different materials. We do the basic design by using "Effective Medium Theorem."
And we verify and improve the result by using rigorous couple-wave analysis (RCWA). In the range of
visible wavelength, the polarizer has high contrast and high tolerance of incident angle in
We proposed a new model to analyze Bragg selectivity of volume holograms in spatial domain as well as in temporal domain. The applications of volume holographic filters to surface variation detection and high dense wavelength filtering are presented.
Two volume holographic storage schemes using random phase multiplexing technique are presented. A ground glass is spatially shifted to multiplex the signals for both storage schemes. The diffraction selectivity of the ground glass is experimental investigated and theoretically analyzed.